With the exact same swappable barrel system as the 455 and the same reliable polymer magazine system" the 457 is without a doubt the best rimfire platform CZ has ever fielded. The 457 now features a trigger adjustable for weight" creep and over-travel. The stamped bottom metal of the 455 is gone" swapped for a classy two-piece interlocking system. To make scope fitment easier" CZ ditched the 90 degree bolt rotation in favor of a 60 degree" allowing for larger ocular bell diameters with lower ring heights.